Method and apparatus for inductively generating heat in applying rail-bonds and the like.



G. H. BOLUS.

METHOD AND APPARATUS FOR INDUCTIVELY GENERATING HEAT IN APPLYING RAIL BONDS AND THE LIKE.

APPLICATION FILED JULY 31. H6.

1 ,201 ,929. Patel lted Oct. 17, 1916.

5a URCE 0F 5 UPPL v IIIIIIIIIIIIII 1 1%iim Fig, 3

gwue'nl'oz GLENN/i 801.05 Wflneoow UNITED STATES PATENT OFFICE.

' GLENN H. BOLUS, OF MANSFIELD, OHIO, ASSIGNOB TO THE OHIO BRASS COMPANY, OF

MANSFIELD, OHIO, A CORPORATION OF NEW JERSEY.

METHOD AND APPARATUS FOR INDUCTIVELY GENERATING HEAT IN APPLYING RAIL- BONDS AND THE LIKE.

Specification of Letters Patent.

Patented Oct. 1'7, 1.916.

Application filed July 31, 1916. Serial No. 112,377.

To all whom it may concern. 7

Be it known that I, GLENN H. BoLUs, a citizen of the United States, residing at .Mansfield, in the county of Richland and State of Ohio. have invented certain new and useful Improvements in Methods and Apparatus for Inductively Generating Heat in Applying Rail-Bonds and the like, of which the following is a specification.

My invention relates to the art of generating or producing heatand the object of my invention is to provide an improved device for inductively generating or producing localized heat for purposes such as welding, brazing, soldering and the like.

In the accompanying drawing I have illustrated several ways by which my invention may be carried out.

Figure 1 is a front elevation view of one form of my device for use in applying rail bonds. Fig. 2 is an end elevation view of Fig. 1 taken at right angles. Fig. 3 is a sectional view of Fig. 1 on the line 33.

Fig. 4 is a front elevation view of a modified form of my device as applied to the uniting together of 2 pieces of metal.

I have found in practice that by subjecting iron or steel or any other metal susceptible to magnetization, to the inductive influence of a varying magnetic field, I am enabled to inductively generate or produce in said metal a high degree of heat sufficient for the purposes of uniting said metals by soldering or brazing.

In addition to the secondary currents of great volume induced as above. eddy currents will be created in the parts to be heat-.

ed and assist in heating the parts to be united. I have further found that the heat so generated or produced will be localized or concentrated within the portions of the metal which are under the influence of the varying magnetic field. An alternating or reversing magnetic field I have found to be the best for my purpose although a pulsating field may be used also. As a result of hysteresis due to the rapid change in magnetization of the metal and the eddy currents induced in the metals to be united, the temperature of the pieces to be unitedwill be raised. The intensity of these induced heating effects is proportional to various factors, such as the quality and characteristics of the metal to be heated and the frequency and density of the magnetic field. which enter into the design of an apparatus to meet particular requirements. These heating effects may be inductively produced by circulating. an alternating current in a suitable winding and placing the metal to be treated within the influence of the magnetic field created thereby.

I find that the best results may be obtained in the most economical and convenient manner by providing the winding with a core which constitutes a closed magnetic circuit with the exception of a gap at one point wherein the metal to be heated may be interposed.

Figs. 1, 2, 3, and 4 show two forms of device for use in the application of rail bonds to a rail and to the uniting together of two pieces of metal. It will be seen that the core 1 is rectangular in form and preferably in section. It is provided with a magnetizing winding 2 on one of its legs, which winding may be connected by its terminals 3 to any suitable source of alternating current. This core thus forms a path or circuit for the lines of force set up by the winding and in this manner practically the entire magnetic field set up by the winding can be concentrated within the cross-sectional area of the core in the most effective manner. The core 1 has a gap in which the web of the rail 4 and the bond 5 to be attached thereto are interposed. 'Between the rail 4 and the bond 5 is placed a strip of solder or braze metal 6. I prefer that the core 1 be laminated as shown in section in Fig. 2 and otherwise constructed so that hysteresis and eddy currents Will be concentrated or confined in the rail web and bond. In this manner a suliicient degree of heat can be inductively generated to readily solder or braze the bond to the rail by the solder or braze metal 6 which will melt and unite the bond and rail.

One feature of my device is the hinged or pivoted members of the core at the two points 7 which permits the core to be closed and opened so that the metals to be heated may be readily inserted in place and removed therefrom. These hinged members shown in Figs. 1 and 2 may be operated by means of a screw having a right and left hand screw 8 operating in the ends of two non-magnetic arms 9 attached to the hinged members 1 of the core, and a suitable'hand wheel 10 may be mounted on the screw 8 to operate it. Another advantage of the core being hinged is that when the parts I and rail or other parts to be united, thus insuring a secure and reliable union between the parts, and such pressure isapplied until the solder or braze is set or solidified.

Fig. 4 shows two pieces of metal 11 and 12 interposed in the magnetic circuit to be heated and uniting metal 13 interposed between the members 11 and 12. In this fig.- ure is shown the same device as in Figs. 1 and 2 except the screw operating parts are eliminated and the magnetic attraction relied upon to hold the hinged members of the core and parts to be heated in firm contact. I

The members of the core being made up of layers of magnetic material preferably iron or steel, the layers are alternated at the joints and held together in close relation but movable about the hinge bolt 7 Claims:

1. The method of bonding rails herein described, which consists in positioning on the rail a bond with solder interposed, then subjecting the rail, bond and solder to the inductive influence of a varying magnetic field and concentrating therein the hysteresis and eddy currents inductively produced by the varying magnetic field until a temperature suflicient to melt the solder has been produced in the rail and bond.

2. The method of bonding rails herein de scribed, which consists in positioning on the rail a bond with solder and flux interposed, thenxplacing the rail and bond between the adjustable jaws of an electro-magnet and subjecting the bond and rail to the inductive influence of a varying magnetic field and concentrating therein the hysteresis and eddy currents inductively produced by the varying magnetic field until a temperature suflicient to melt the solder has been reached,

and then bringing pressure to bear upon the bond and rail by means of the ad ustable jaws to make a more intimate contact between the rail and bond.

rails comprising a laminated magnet core having an adjustable gap'therein for receiving the rail to b bonded, and a winding 1 on said core connected to a source of alternating current for creating in the gap an alternating field.

4. The improved apparatus for bonding rails, comprising a laminated magnet core having an adjustable gap therein for receiving the rail to be bonded and a winding on said core connected to a source of pulsating current for creating in said gap an alternating magnetic field.

5. The improvements in rail bonding apparatus herein described, being a laminated core member forming a substantially closed magnetic circuit, but having an adjustable gap wherein the rail to be heated is interposed, and a winding on said core connected to a source of current and adapted to create a varyin magnetic field in said magnetic circuit w ereby the interposed rail will'be heated due to the hysteresis and eddy currents inductively induced in said rail.

6. The improvements in rail bonding apparatus herein described, being a laminated core member forming a substantially closed magnetic circuit, but.having a gap wherein the fail to be heated is interposed, and a winding on said core connected to a source of current and adapted to create a varying magnetic field in the magnetic circuit whereby the interposed rail will be locally heated due to the hysteresis and eddy currents inductively developed in the rail and means for clamping said core in engagement with the rail.

7. The improved apparatus for bonding rails, comprising a laminated magnetic core having a gap therein for receiving the rail to be bonded, a winding on said core connected to a source of alternating current for creating in said gap an alternating magnetic field and means 'for changing the width of said gap.

In testimony whereof I aflix my signature in the presence of two witnesses.

-. GLENN H. BOLUS.

Witnesses: 

